Study On Alarming System About The Leakage Of Harmful Chemical Gas

Without any measure about the leakage of poisonous gas , there will be thumping damages , even people's lives, in petrochemical industry etc.. If we can judge the leakage of poisonous gas earlier, and take measures before the accident enlarge ,we can avoid safety misadventure. This thesis is carried on the research of the leaking alarming system on the background of Shijiazhuang chemical-fabric manufactory, supported by a National Program 863 item "The Mobile Manipulator system aimed at measurement and maintenance, working in the circumstance of chemistry dangerous leakage from the chemistry dangerous reactor" (item serial number :2003AA421040).This paper generalized some means about the alarming system of gas leakage ,and has confirmed the means on the system , which use fixed detection and wireless communication . The gas sensors and its' transmitters are studied, especially about the NH3 sensor, TGS824, which is semiconductor sensor, and SO₂ sensor, SO₂-BF ,which is electronic-chemical sensor. The MSP430 single chip computer is used as central processing unit in this alarming system. The MSP430F149 single chip computer can do much work, such as A/D conversion , data's conversion , data's compare , data's storage , data's coding and data's transmission .The three-level-unit wireless communication is also studied in this paper, which can adapt the industrial theater perfectly .Two wireless modules are used to fit for wireless communication in this paper , according to collecting and comparing plenty of files . There are two alarming forms , one is fail self-scan alarm, which is used to assure the system's reliability, the other is leaking alarm . The fail self-scan alarm is started from the upper to the bottom, and the leaking alarm is started from the bottom to the upper. The upper unit use different dialog box to transfer the alarming information comes from the industrial theater.